library: remove useless condition in ceph_volume
library: remove useless condition in ceph_volume

Since the action values are already defined as a list of choices in
ansible then we will never enter into this condition.

Signed-off-by: Dimitri Savineau <a50a620e679eed14f4e99998b821cea8884cf228@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible